Diamond DA 40 Flight Manual page 253

Airplane
DA 40 AFM
Description
Button 1 - Lean Mode
Upon powering up the unit the Normal mode is shown. Between the colored sector
markings the cylinder head temperatures of the individual cylinders are shown by bars.
Above those are bars showing the exhaust gas temperatures of the individual cylinders.
In the event of the failure of a sensor the relevant indication remains empty. A flashing
cylinder head temperature indication means either that the cylinder is too hot, or that it
is being cooled too rapidly (shock-cooling).
The operation of button 1 causes the display to move to Lean mode. This is confirmed
by two half-bars appearing to the left and right of the bar blocks. In this mode all bars which
previously showed cylinder head and exhaust gas temperature are used for exhaust gas
%
temperature only. One bar represents 10 °F (4.6 °C). If the columns are completely filled
with bars before the mixture is lean, button 1 should be pressed twice so that the bars
start again at the base of the indicator.
A flashing bar column indicates that the relevant cylinder has reached the hottest exhaust
gas temperature. This point will be marked with a single bar, which can be used as a
reference for enriching the mixture. As an option, the numerical indication can be used
additionally for this purpose.
Doc. # 6.01.01-E Rev. 8 01-Dec-2010 Page 7 - 27